Cyclic covering morphisms on $\bar{M}_{0,n}$

Details Cyclic covering morphisms on $\bar{M}_{0,n}$ Cyclic covering morphisms on $\bar{M}_{0,n}$

2011-05-03

arxiv.org/abs/1105.0655v2

Mathematics

Algebraic Geometry

New Proposition 5.5

Scientific paper

We study cyclic covering morphisms from $\bar{M}_{0,n}$ to moduli spaces of unpointed stable curves of positive genus or compactified moduli spaces of principally polarized abelian varieties. Our main application is a construction of new semipositive vector bundles and nef divisors on $\bar{M}_{0,n}$, with a view toward the F-conjecture. In particular, we construct new extremal rays of the symmetric nef cone of $\bar{M}_{0,n}$. We also find an alternate description of all sl level 1 conformal blocks divisors on $\bar{M}_{0,n}$.

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